United have 1,500 fans travelling to Italy for Wednesday's Champions League tie and have given them detailed instructions in which they are warned of the dangers of being ambushed if they walk or take the underground to the stadium.

"I've certainly not got anyone going this year,' said Ferguson, who was shocked at the scale of the trouble last season.

"I'm surprised there are so many fans going after last year's experience and I hope the police have more consideration."